package com.punai.common.utils;

import cn.hutool.core.util.RandomUtil;
import cn.hutool.core.util.StrUtil;
import com.punai.common.constant.UserConstants;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import com.punai.common.constant.HttpStatus;
import com.punai.common.core.domain.model.LoginUser;
import com.punai.common.exception.ServiceException;
import org.springframework.security.crypto.codec.Hex;
import org.springframework.security.crypto.codec.Utf8;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * 安全服务工具类
 * 
 * @author ruoyi
 */
public class SecurityUtils
{
    /**
     * 用户ID
     **/
    public static Long getUserId()
    {
        try
        {
            return getLoginUser().getUserId();
        }
        catch (Exception e)
        {
            throw new ServiceException("获取用户ID异常", HttpStatus.UNAUTHORIZED);
        }
    }

    /**
     * 获取部门ID
     **/
    public static Long getDeptId()
    {
        try
        {
            return getLoginUser().getDeptId();
        }
        catch (Exception e)
        {
            throw new ServiceException("获取部门ID异常", HttpStatus.UNAUTHORIZED);
        }
    }
    
    /**
     * 获取用户账户
     **/
    public static String getUsername()
    {
        try
        {
            return getLoginUser().getUsername();
        }
        catch (Exception e)
        {
            throw new ServiceException("获取用户账户异常", HttpStatus.UNAUTHORIZED);
        }
    }

    /**
     * 获取用户
     **/
    public static LoginUser getLoginUser()
    {
        try
        {
            Object principal = getAuthentication().getPrincipal();
            return (LoginUser) principal;
        }
        catch (Exception e)
        {
            throw new ServiceException("获取用户信息异常", HttpStatus.UNAUTHORIZED);
        }
    }

    /**
     * 获取公司
     */
    public static Long getCompanyId()
    {
        try
        {
            return getLoginUser().getCompanyId();
        }
        catch (Exception e)
        {
            throw new ServiceException("获取公司信息异常", HttpStatus.UNAUTHORIZED);
        }
    }


    /**
     * 获取Authentication
     */
    public static Authentication getAuthentication()
    {
        return SecurityContextHolder.getContext().getAuthentication();
    }

    /**
     * 生成BCryptPasswordEncoder密码
     *
     * @param password 密码
     * @return 加密字符串
     */
    public static String encryptPassword(String password)
    {
        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
        return passwordEncoder.encode(password);
    }

    public static String md5EncodePassword(String password)
    {
        String saltedPass = password;
        MessageDigest messageDigest = null;
        try{
            messageDigest = MessageDigest.getInstance("MD5");
        }catch (NoSuchAlgorithmException e) {

        }
        byte[] digest = messageDigest.digest(Utf8.encode(saltedPass));
        return new String(Hex.encode(digest));
    }

    public static boolean matchesMD5Password(CharSequence rawPassword, String encodedPassword)
    {
        String salt = encodedPassword.substring(encodedPassword.length() - UserConstants.SYS_USER_SALT_NUM);
        encodedPassword = encodedPassword.substring(0,encodedPassword.length() - UserConstants.SYS_USER_SALT_NUM);
        String spass = md5EncodePassword(rawPassword + salt);
        return StrUtil.equals(spass,encodedPassword);
    }

    public static String getRandomSalt() {
        return RandomUtil.randomString(UserConstants.SYS_USER_SALT_NUM);
    }

    public static String getSalt(String encodedPassword) {
        return encodedPassword.substring(encodedPassword.length() - UserConstants.SYS_USER_SALT_NUM);
    }


    /**
     * 判断密码是否相同
     *
     * @param rawPassword 真实密码
     * @param encodedPassword 加密后字符
     * @return 结果
     */
    public static boolean matchesPassword(String rawPassword, String encodedPassword)
    {
        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
        return passwordEncoder.matches(rawPassword, encodedPassword);
    }

    /**
     * 是否为管理员
     * 
     * @param userId 用户ID
     * @return 结果
     */
    public static boolean isAdmin(Long userId)
    {
        return userId != null && 1L == userId;
    }
}
